In this video, I’ll walk you through how to wire a 3G alternator upgrade on a Foxbody Mustang, solving the infamous green wire mystery along the way! If you've been wondering how to properly modify your factory headlight harness for a 3G alternator conversion, this step-by-step guide has got you covered. When I bought my Foxbody, the previous owner had already installed a 3G alternator but left a critical green wire disconnected. After some investigation—and a light bulb moment—I realized the 3G alternator plug included with the alternator is identical to the one on the factory headlight harness. That revelation changed everything! In this video, I’ll explain: How the 3G alternator plug works with the factory harness. Why modifying your Foxbody Mustang's wiring is crucial for a 3G alternator upgrade. Step-by-step instructions for properly wiring the alternator for reliability and safety. Whether you're troubleshooting your own 3G alternator wiring or planning a full alternator upgrade, this guide will help you do it right the first time.